It started with an Instagram Post, but like all questions about Bach, to answer the question of Bach's 'longest' piece required posing further questions:  
Longest how? Minutes? In terms of Measures? In terms of the longest single piece on a concert? ...wait, what is a 'piece' anyhow? Does one of the passions count as a single piece? What about just the amount of notes? 
You may be surprised to hear the answers... or maybe you've know the answer in your heart of hearts all along.
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